A few ideas:
* Make sure you have downloaded and are running Fluid 1.2 (not a prior version)
* Make sure you drop the License on the Fluid icon, not the icon of a FluidApp you've created
* Some email clients are having trouble with my license file.
Please ensure that the file extension for the license file is ".fluidlicense". so your file should be named: ".fluidlicense".
if the file extension has been changed to anything else (like '.html'), please change it to '.fluidlicense' and try again. that should fix the issue until i can issue a new version of Fluid that is more forgiving of these things.